feat: stfu で削除個数を指定できるように

[MikuroXina]

Closes #347.

Type of Change:

機能の新規追加

Details of implementation (実施内容)

!stfu 25
のように削除個数を指定できるようになりました. 指定した回数分繰り返して実行したのと同じ扱いになります.

#347 で提案されていた探索範囲を指定できるようにする機能は, 大きくしすぎると予期しない古いメッセージの削除を招き, 小さくしすぎると全く削除できません. 少し使いづらいと判断して実装しませんでしたが, うまい活用方法やコマンド体系, 機能などがあればお申し付けください.

[codecov-commenter]

Codecov Report

Merging #364 (e061add) into main (5ec6ef6) will increase coverage by 0.03%.
The diff coverage is 82.60%.

@@            Coverage Diff             @@
##             main     #364      +/-   ##
==========================================
+ Coverage   69.25%   69.29%   +0.03%     
==========================================
  Files          53       53              
  Lines        3487     3504      +17     
  Branches      331      335       +4     
==========================================
+ Hits         2415     2428      +13     
  Misses        741      741              
- Partials      331      335       +4     

Flag	Coverage Δ
unittests	69.29% <82.60%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/service/command/stfu.ts	86.11% <82.60%> (-2.98%)	⬇️

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[github-actions]

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